EP1142978B1 - Coke hautement reactif et hautement resistant pour haut fourneau et son procede de production - Google Patents

Coke hautement reactif et hautement resistant pour haut fourneau et son procede de production Download PDF

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Publication number
EP1142978B1
EP1142978B1 EP00969889A EP00969889A EP1142978B1 EP 1142978 B1 EP1142978 B1 EP 1142978B1 EP 00969889 A EP00969889 A EP 00969889A EP 00969889 A EP00969889 A EP 00969889A EP 1142978 B1 EP1142978 B1 EP 1142978B1
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Prior art keywords
coal
coke
vol
pores
diameter
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EP00969889A
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German (de)
English (en)
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EP1142978A1 (fr
EP1142978A4 (fr
Inventor
Koji Kawasaki Steel Corp. Tech. Res. Lab. HANAOKA
Seiji Kawasaki St. Corp. Tech. Res. Lab. SAKAMOTO
Katsutoshi Kawasaki S. Corp. Tech. Res. Lab IGAWA
Yutaka Kawasaki St. Corp. Tech. Res. Lab YAMAUCHI
Shizuki Kawasaki Steel Corporation KASAOKA
Toshiro Kawasaki Steel Corporation SAWADA
Koichi Kawasaki Steel Corporation SHINOHARA
Yuji Kawasaki Steel Corporation TSUKIHARA
Shinjiro Kawasaki Steel Corporation BABA
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JFE Steel Corp
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JFE Steel Corp
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
    • C10B57/04—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition

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  • the present invention relates to a blast furnace coke having high reactivity and high strength and a method of producing such blast furnace coke, and more particularly, to coke in which coke strength, reactivity with CO 2 and a pore size distribution are each at a desired level and a method of producing such coke.
  • the coke in the blast furnace reacts with carbon dioxide (CO 2 ) to be partially gasified whereupon the coke becomes porous effecting a decrease of strength thereof.
  • CO 2 carbon dioxide
  • a technique to reduce the reactivity with CO 2 has heretofore been under review; however, such technique causes an increase of energy cost of the blast furnace. Therefore, it is not advantageous from a standpoint of cost reduction and nowadays an operation with a low fuel ratio is rather required.
  • it is effective to pursue an increase of a reduction efficiency in the blast, furnace by decreasing an operational temperature down to a temperature in a thermal reserve zone in a neighborhood of wustite-iron reduction equilibrium. For the reason described above, it is considered to use high reactive coke ( CAMP-ISIJ, Vol. 5 (1992) 156 ).
  • a method of producing such high reactive coke a method of increasing a ratio of non- to slight-caking coal in a material coal blend, a method of adding an inert coal material, that is, blending an inert substance as disclosed in Japanese Patent Laid-Open No. 313171/1994 and a method of blending char derived from a low carbonization coal as disclosed in Japanese Patent Laid-Open No. 117991 have been attempted.
  • An object of the present invention is to provide a blast furnace coke in which CO 2 reactivity is high and coke strength is large.
  • Another object of the present invention is to produce blast furnace coke having high reactivity and high strength at a low cost by using a coal blend composed of a small number of brands comprising a large quantity of semi-strong caking coal having medium rank and low fluidity (hereinafter referred to simply as "medium rank low fluidity coal").
  • the present invention proposes a blast furnace coke having high reactivity and high strength, the blast furnace coke being a coke that can be obtained by a method comprising the steps of:
  • the above-described pore size distribution is controlled such that a content ratio of pores having a diameter of less than 1 ⁇ m is 6 vol% or more and a content ratio of pores having a diameter of 100 ⁇ m or more is less than 20 vol%
  • the present invention is a blast furnace coke having high reactivity and high strength, the blast furnace coke being coke that can be obtained by the method comprising the steps of:
  • a caking coal in which a mean reflectance (Ro) is 1.3 or more and/or a semi-heavy caking coal in which a maximum fluidity (MF) is 3.0 or more is used as the balance of the above-described coal blend.
  • the tumbler strength (wt% of +6 mm after 400 rotations; hereinafter referred to as "TI 6 ") is 83% or more.
  • the present invention proposes a production method of a blast furnace coke having high reactivity and high strength characterized by comprising the steps of:
  • a production method of a blast furnace coke having high reactivity and high strength characterized by comprising the steps of:
  • a caking coal in which a mean reflectance (Ro) is 1.3 or more and/or a semi-heavy caking coal in which a maximum fluidity (MF) is 3.0 or more is used as the balance of the above-described coal blend.
  • the tumbler strength TI 6 is 83 % or more.
  • the pore size distribution is controlled such that a volumetric content ratio of pores having a diameter of less than 1 ⁇ m is 6 vol% or more and a volumetric content ratio of pores having a diameter of 100 ⁇ m or more is 20 vol% or less.
  • a blend composed of a small number of brands (about 5 brands or less) in which a large quantity of coal low in cost and abundantly available is blended can be realized whereupon a coke having a higher reactivity with CO 2 than an ordinary one and having coke strength equal to or higher than an ordinary one can be produced in a consistent manner.
  • coke produced from coal primarily composed of coal having a large quantity of inert component is rich in fine pores having a diameter of less than 10 ⁇ m, particularly less than 1 ⁇ m and has a large specific surface area;
  • the coke is relatively scarce in coarse pores having a diameter of from 10 ⁇ m to 100 ⁇ m, particularly 100 ⁇ m or more which are considered to affect coke strength;
  • the reaction with CO 2 centers in such fine pores which prevents the fine pores from becoming coarse, effectively acts on coke strength after reaction and enhances degradation resistance;
  • (4) though the above-described topochemical effect is generated, degradation resistance as described in (3) is generated; and other characteristics.
  • a coal blend having a blending ratio as high as 60 % to 95 % of coal having medium rank and low fluidity in which a non-melting inert content is 30 % or more is carbonized in a coke oven.
  • This coal having medium rank and low fluidity is classified as a semi-heavy caking coal petrographically. Though most of semi-heavy caking coals having a relatively high fluidity have 3.0 or more of maximum fluidity (MF) which is an indicator of caking property (encircled portion in FIG. 2 ), such coal having medium rank and low fluidity, as shown as shaded portion in FIG.
  • MF maximum fluidity
  • coal structure 2 has lower maximum fluidity than the maximum fluidity and, further, a coal structure thereof , as shown in x coal and y coal described in Table 1, contains a large quantity of semi-fusinite, fusinite and the like which are inert components.
  • this coal structure containing a large quantity of inert components coke derived from this coal having medium rank and low fluidity is characterized by a large quantity of fine pores therein, as shown in FIG. 3 .
  • Quality of coal having medium rank and low fluidity which is characterized as above has mean reflectance of 0.9 to 1.1 and maximum fluidity of 3.0 or less; such quality is approximately same as that (mean reflectance being about 1.07, maximum fluidity being 2.45) of a coal blend composed of multiple brands for use in an ordinary production of cokes. Nevertheless, inventors' study has found that, when two types of coal which are of approximately same quality, namely, a coal having medium rank and low fluidity and an ordinary coal blend are mixed, coke strength has decreased, as shown in FiG. 4 , though qualities of both types of coal are approximately same with each other, and that even a target coke strength can not be maintained.
  • coke strength here means the above-described tumbler strength TI 6 ; an axis of ordinate in FIG. 5 shows improvement effects of tumbler strength of coke obtained by blending a coal having medium rank and low fluidity and caking coals (from A to F) under a condition that the coke strength of coke obtained by coking a single-brand coal having medium rank and low fluidity is set as 0.
  • the axis of ordinate shows strength difference between a single-brand coke derived from coal having medium rank and low fluidity and a coke derived from a coal blend prepared by blending a coal having medium rank and low fluidity and a caking coal wherein the value 1.0 thereon represents an example of a process control target value.
  • numerals in FIG. 5 show blending ratios between a coal having medium rank and low fluidity and caking coals (from A to F).
  • An axis of abscissa shows mean reflectance (Ro) of a caking coal.
  • a coal having medium rank and low fluidity can obtain a target coke strength (TI 6 being approximately 84 %) which is an indicator as to whether it can be used in a blast furnace by being blended with 5 wt% to 40 wt% of each of caking coals (from A to F) thereto.
  • TI 6 being approximately 84 % of each of caking coals
  • caking coal is an expensive type of coal, it can be said that it is desirous to suppress a blending ratio of this caking coal from a standpoint of coke production cost. Therefore, in the present invention, it is desirous to use at least one type of caking coal having mean reflectance of 1.3 or more which is highly effective in improving coke strength. In other words, this is because that use of caking coal having mean reflectance of 1.3 or more shows an improvement effect only by a blending ratio of about 5 wt% to about wt20 %.
  • coal having medium rank and low fluidity is classified petrographically as semi-heavy caking coal having similar mean reflectance, since it has mean reflectance Ro of 0.9 to 1.1; however, coal having medium rank and low fluidity has a relatively large quantity of an inert component among semi-heavy caking coal or compared with heavy caking coal having higher mean reflectance so that it is characterized by low fluidity.
  • fine pores of less than 10 ⁇ m occupies a large share in the a single-brand coke obtained from only a coal having medium rank and low fluidity; to contrast, a number of fine pores in a coke blend derived from a blend of coal having medium rank and low fluidity and a caking coal is a little less than the above but is larger than that of the ordinary coke. Further, in this case, a volume percent of relatively coarse pores of from 10 ⁇ m to 100 ⁇ m is smaller than that of the ordinary coke.
  • the present invention can achieve the following:
  • BWR Black water
  • a blast furnace coke can be produced in an assured manner by controlling coke strength after reaction with CO 2 by means of a volumetric content ratio of fine pores having a diameter of less than 10 ⁇ m, preferably less than 1 ⁇ m and a volumetric content ratio of coarse pores having a diameter of from 10 ⁇ m to 100 ⁇ m and, further, that of coarse pores having a diameter of 100 ⁇ m or more.
  • a pore size distribution in which a content ratio of pores having a diameter of less than 10 ⁇ m is from 12 vol% to 15 vol%, preferably that of pores having a diameter of less than 1 ⁇ m is 6 vol% or more, a content ratio of pores having a diameter of from 10 ⁇ m to 100 ⁇ m is from 10 vol% to 15 vol% and, further, in addition thereto, a content ratio of pores having a diameter of 100 ⁇ m or more is 20 vol% or less.
  • a coke having high reactivity and high strength can be obtained by blending 60 wt% or more of a coal having medium rank and low fluidity in which a content ratio of inert component is 30 wt% or more or mean reflectance (Ro) is from 0.9 to 1.1, and maximum fluidity is 3.0 or less and the balance being a caking coal in which mean reflectance (Ro) is 1.3 or more and/or a semi-caking coal in which maximum fluidity (MF) is 3.0 or more.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Coke Industry (AREA)

Abstract

La présente invention concerne un coke hautement réactif et hautement résistant destiné à un haut fourneau qui est produit par carbonisation d'un mélange de charbon contenant au moins 60 % en poids d'un charbon agglutinant moyen ayant un degré de carbonification moyen et une faible aptitude à l'écoulement lequel contient au total au moins 30 % en volume de constituants inertes, ou un mélange de charbon qui contient de 60 à 95 % en poids d'un charbon agglutinant moyen ayant un degré de carbonification moyen et une faible aptitude à l'écoulement présentant un facteur de réflexion moyen (Ro) compris entre 0,9 et 1,1 et une aptitude à l'écoulement maximale (MF) inférieure ou égale à 3,3, la quantité restante d'un charbon agglutinant présentant un facteur de réflexion moyen (Ro) supérieur à 1,1, ce système se caractérisant par une répartition des diamètres des pores telle que la quantité de pores ayant un diamètre inférieur à 10 microns représente entre 12 et 15 % en volume et que la quantité des pores ayant un diamètre compris entre 10 et 100 microns représente entre 10 et 15 % en volume. Le fait d'utiliser un mélange de charbon formé d'un petit nombre de charbons de marque contenant une grande quantité de charbon agglutinant ayant un degré de carbonification moyen et une faible aptitude à l'écoulement, permet de produire à faible coût, du coke à forte réactivité et à forte résistance ayant des niveaux recherchés de résistance du coke, de réactivité avec le CO2 ou de distribution des diamètres des pores.

Claims (10)

  1. Coke de haut fourneau présentant une haute réactivité et une haute résistance mécanique, le coke de haut fourneau étant un coke pouvant être obtenu par un procédé comprenant les étapes :
    de chargement d'un mélange de charbon comprenant 60 % en poids ou plus de charbon agglomérant semi-lourd présentant un degré de carbonisation moyen et une fluidité faible dans lequel une teneur de composant inerte non fusible est de 30 % en volume ou plus au total dans un four à coke ; et
    de cokéfaction du mélange de charbon,
    caractérisé en ce qu'il comporte une distribution de taille de pore dans laquelle un rapport de teneur de pores présentant un diamètre inférieur à 10 µm est de 12 % en volume à 15 % en volume et un rapport de contenu de pores présentant un diamètre de 10 µm à 100 µm est de 10 % en volume à 15 % en volume.
  2. Coke de haut fourneau présentant une haute réactivité et une haute résistance mécanique, le coke de haut fourneau étant du coke qui peut être obtenu par le procédé comprenant les étapes :
    de chargement d'un mélange de coke comprenant de 60 % en poids à 95 % en poids de charbon agglomérant semi-lourd présentant un degré de carbonisation moyen et une fluidité faible dans lequel une réflectance moyenne (Ro) est de 0,9 à 1, 1 et une fluidité maximum (MF) est de 3, 0 ou moins et le reste étant un charbon agglomérant dans lequel une réflectance moyenne (Ro) dépasse 1,1 dans un four à coke ; et
    de cokéfaction du mélange de charbon,
    caractérisé en ce qu'il comporte une distribution de taille de pore dans laquelle un rapport de teneur de pores présentant un diamètre de moins de 10 µm est de 12 % en volume à 15 % en volume et un rapport de teneur de pores présentant un diamètre de 10 µm à 100 µm est de 10 % en volume à 15 % en volume.
  3. Coke selon la revendication 1 ou 2, dans lequel le reste dudit mélange de charbon est caractérisé par un charbon agglomérant dans lequel une réflectance moyenne (Ro) est de 1,3 ou plus et/ou un coke agglomérant semi-lourd dans lequel une fluidité maximum (MF) est de 3,0 ou plus.
  4. Coke selon l'une quelconque des revendications 1 à 3, dans lequel une résistance au culbuteur TI6 est caractérisée en ce qu'elle est de 83 % ou plus.
  5. Coke selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la distribution de taille de pore est régulée de sorte qu'un rapport de teneur de pores présentant un diamètre de moins de 1 µm est de 6 % en volume ou plus et un rapport de teneur de pores présentant un diamètre de 100 µm ou plus est de 20 % en volume ou moins.
  6. Procédé de production d'un coke de haut fourneau présentant une haute réactivité et une haute résistance mécanique caractérisé en ce qu'il comprend les étapes :
    de chargement d'un mélange de charbon comprenant 60 % en poids ou plus de charbon agglomérant semi-lourd présentant un coefficient de réflexion et une fluidité faible dans lequel une teneur de composant inerte non fusible est de 30 % en volume ou plus au total dans un four à coke ; et
    de cokéfaction du mélange de charbon,
    dans lequel le coke de haut fourneau est un coke comportant une distribution de taille de pore dans laquelle un rapport de teneur de pores présentant un diamètre de moins de 10µm est de 12 % en volume à 15 % en volume et un rapport de teneur de pores présentant un diamètre de 10 µm à 100 µm est de 10 % en volume à 15 % en volume.
  7. Procédé de production d'un coke de haut fourneau présentant une haute réactivité et une haute résistance mécanique caractérisé en ce qu'il comprend les étapes :
    de chargement d'un mélange de coke comprenant de 60 % en poids à 95 % en poids de charbon agglomérant semi-lourd présentant un coefficient de réflexion et une fluidité faible dans lequel une réflectance moyenne (Ro) est de 0,9 à 1,1 et une fluidité maximum (MF) est de 3,0 ou moins et le reste étant un coke agglomérant dans lequel une réflectance moyenne (Ro) dépasse 1,1 dans un four à coke ; et
    de cokéfaction du mélange de charbon,
    dans lequel le coke de haut fourneau est un coke comportant une distribution de taille de pore dans laquelle un rapport de teneur de pores présentant un diamètre de moins de 10µm est de 12 % en volume à 15 % en volume et un rapport de teneur de pores présentant un diamètre de 10 µm à 100 µm est de 10 % en volume à 15 % en volume.
  8. Procédé de production selon la revendication 6 ou 7, caractérisé par l'utilisation d'un charbon agglomérant dans lequel une réflectance moyenne (Ro) est de 1,3 ou plus et/ou d'un charbon agglomérant semi-lourd dans lequel une fluidité maximum (MF) est de 3,0 ou plus en tant que reste dudit mélange de charbon.
  9. Procédé de production selon l'une quelconque des revendications 6 à 8, dans lequel la résistance au culbuteur TI6 est caractérisée en ce qu'elle est de 83 % ou plus.
  10. Procédé de production selon l'une quelconque des revendications 6 à 9, caractérisé en ce que la distribution de taille de pore est régulée de sorte qu'un rapport de teneur volumétrique de pores présentant un diamètre de moins de 1 µm est de 6 % en volume ou plus et un rapport de teneur des pores présentant un diamètre de 100 µm ou plus est de 20 % en volume ou moins.
EP00969889A 1999-10-20 2000-10-19 Coke hautement reactif et hautement resistant pour haut fourneau et son procede de production Expired - Lifetime EP1142978B1 (fr)

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Application Number Priority Date Filing Date Title
JP29860999 1999-10-20
JP29860999 1999-10-20
JP2000278604 2000-09-13
JP2000278604A JP4608752B2 (ja) 1999-10-20 2000-09-13 高炉用高反応性高強度コークスおよびその製造方法
PCT/JP2000/007269 WO2001029151A1 (fr) 1999-10-20 2000-10-19 Coke hautement reactif et hautement resistant pour haut fourneau et son procede de production

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EP1142978A4 EP1142978A4 (fr) 2011-03-09
EP1142978B1 true EP1142978B1 (fr) 2012-02-29

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US (1) US6875316B1 (fr)
EP (1) EP1142978B1 (fr)
JP (1) JP4608752B2 (fr)
KR (1) KR100592202B1 (fr)
CN (1) CN1264952C (fr)
AU (1) AU777719B2 (fr)
BR (1) BR0007234B1 (fr)
CA (1) CA2356690C (fr)
TW (1) TW593661B (fr)
WO (1) WO2001029151A1 (fr)

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KR102467182B1 (ko) * 2015-12-17 2022-11-17 주식회사 포스코 코크스 제조방법
BR112021012438A2 (pt) * 2018-12-26 2021-09-08 Jfe Steel Corporation Método de produção de minério sinterizado
CN110411885A (zh) * 2019-06-04 2019-11-05 酒泉钢铁(集团)有限责任公司 一种评价高炉内焦炭劣化的方法
CN111253961B (zh) * 2020-01-21 2021-05-28 鞍钢股份有限公司 一种提高焦炭平均粒度及改善焦炭粒度分布的炼焦配煤方法
CN111286381B (zh) * 2020-03-23 2021-06-15 汝州天瑞煤焦化有限公司 一种配入黄陵1/2中粘煤的捣固炼焦煤配煤方法
CN113832269B (zh) * 2021-09-22 2023-01-31 西安建筑科技大学 一种降低高炉焦比的中心加焦方法
CN113735116B (zh) * 2021-09-29 2023-02-10 中钢集团鞍山热能研究院有限公司 以纺织废料调控高镜质体粘结性煤基活性炭结构的方法
CN115093868A (zh) * 2022-03-22 2022-09-23 中冶焦耐(大连)工程技术公司 一种富氢高炉用高反应性高强度焦炭及其制备方法
CN114990268B (zh) * 2022-06-21 2023-08-11 首钢集团有限公司 一种高炉的布料方法

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JP3582388B2 (ja) * 1997-12-18 2004-10-27 Ｊｆｅスチール株式会社 冶金用コークスの製造方法
JP3596356B2 (ja) * 1999-06-30 2004-12-02 Ｊｆｅスチール株式会社 冶金用コークスの製造方法、ならびにそれに用いる疑似粒子の製造方法および製造装置

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US6875316B1 (en) 2005-04-05
JP2001187887A (ja) 2001-07-10
CN1264952C (zh) 2006-07-19
AU777719B2 (en) 2004-10-28
KR100592202B1 (ko) 2006-06-23
KR20010089657A (ko) 2001-10-08
CA2356690C (fr) 2008-02-12
TW593661B (en) 2004-06-21
BR0007234A (pt) 2001-10-16
CA2356690A1 (fr) 2001-04-26
EP1142978A1 (fr) 2001-10-10
BR0007234B1 (pt) 2011-01-25
JP4608752B2 (ja) 2011-01-12
CN1341143A (zh) 2002-03-20
EP1142978A4 (fr) 2011-03-09
AU7949500A (en) 2001-04-30
WO2001029151A1 (fr) 2001-04-26

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